It would be good to know what make and model of monitor you have, this info can usually be found on the back on a label. It sounds to me as if the standby circuit has an issue. if you feel up to the job you could dissasemble it and take a look at the internal fuse, the actual switch mechanism itself and any capacitors on the board for the power circuitry. Pictures would allow me to help you more
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1.check with a other monitor. 2.check the cabels should be seated tight.also the videocard should be seated tight. 3.the videocard or the monitor can be brooken check with a new or other monitor first.
I have the 2436V (no speakers), but I suspect the solution will be similar. My screen was a bit to the left of the monitor's physical display area, and I was able to solve it using the built in menu (If you take too long deciding what menu button to press next, the menu will time out. Just start over if that happens. You will get faster with practice).
1) Press the menu button on the monitor (the menu appears). 2) Press the up button on the monitor 4 times to highlight the icon that looks like a slightly angled screen with yellow cross-hairs in one corner (the toolbar for positioning the screen appears - all 5 icons on the positioning toolbar are blue). 3) Press the menu button on the monitor to "enter" the selected toolbar (one of the toolbar icons turns green to indicate the selected tool on the toolbar). 4) Select the tool you need using the up/down arrow buttons on the monitor (I needed the one that moves the screen horizontally, you need the one that moves the screen vertically). 5) Press the menu button on the monitor to activate the selected tool (the meter above the toolbar icon turns green to indicate the tool is active). 6) Use the up/down buttons on the monitor to position the screen. 7) Press the menu button to exit back out (or, just let the menu time out).
Note: the disk that came with the monitor doesn't seem to have drivers for Windows 7, but allowing Windows to search online while updating the driver found a compatible driver online.
Check to see if you have inadvertently hit the CRT button which turns off your screen to turn on an externally connected screen even if there is no external screen plugged in. OR you could have a bad (Back-light) or (Inverter)
Make sure you set up your laptop to display to a second screen. Depending on your Operating system, go to your display properties and go to the settings tab. Then click on the second monitor and enable it.
Check the cable and make sure it is plugged in securely at both the monitor and PC. If the cable is connected properly, then the problem must be in the monitor itself. You could try setting the input mode manually on the monitor - the default should be auto - you could set it to VGA or DVI whichever your case is and see if it helps.
Check the resolution in the Windows while connected to the old monitor. If greater than 1280 X 1024 and/or
the refresh rate exceeds 75 Hz, the monitor may not respond. But you
should at least see the BIOS splash when the computer is turned on. If that does not appear, maybe a problem has occurred in the monitor. Another indicator: if you turn the monitor power button off and then back on, you should get some sign of life such as "no signal", or "out of range". If nothing appears, that would indicate some problem within the monitor.
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Try used your fingers press on the buttons on the monitor and the on screen will appeared. Then just press the next button until you reached the icon (brightness.) Next used the - and + to changed the brightness. Have a nice day!